Improvement in dies for forming sheet metal



H. MARTYN.

Forming Sheet-Meta].

Patented May 25,1875.

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UNITED STATES PATENT OFFICE.

HENRY MARTYN, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN DIES FOR FORMING SHEET METAL.

Specification forming part of Letters Patent No. 163,793, dated May 25,1875; application riled April 5, 1875.

.To all whom it may concern:

Be it known that I, HENRY MARTYN, of Boston, in the county of Suffolkand State of Massachusetts, haveinvented a new and useful Improvement inDies for Forming Sheet- Metal Boxes, of which the following is aspecification:

This invention relates to dies for the manufacture of a seamlesssheet-metal box, the corners of which are closed and continuous with thesides and ends by folds of the sheet metal, which project equally eachside of the corners, and lie against the sides and ends.

The improvement consists more especially in a novel construction of thefemale die, whereby, as the sheet-metal blank is forced through it bythe male die or plunger, the

7 sheet metal at the corners can fold equally each side thereof, andleave the box, when completed, free to be forced out and delivered fromthe die.

In the accompanying plate of drawings, Figure 1 is a plan view of afemale die of the present novel construction, and shows the male die inhorizontal section. Fig. 2 is a section along line an ac, Fig. 1; Fig.3, a plan View of the box; and Fig. 4, side or end view.

In the drawings, A. represents the female die, and B the male die orplunger. The female die is adapted to receive the male die or plunger,and the dimensions of the workingfemale die A opens, as at a, to a spaceor opening, F, behind the working-faces at such corners. These spaces oropenings F back of theworking-faces of thefemale die are bounded bywalls b and c, which incline toward the deliverin g-end G of the die,and thereat open to the working-faces O of the female die. The two wallsat and f of the openings a, leading from the working-faces of the femaledie to the openings F back thereof, at the receiving end H of the die,are flaring, and incline toward each other, coming into lines parallelwith each other, as at h, Fig. 2, which parallel lines terminate at thedelivering end G of the workin g-faces O of the die. The receiving end Hof the female die is provided with guides or gages I, so as to insurethe proper location of the sheet-metal blank before bringing the maledie thereon.

The operation is as follows: The sheet-metal blank is laid on thereceiving end of the female die within and between the guides or gages Ithereof, and then the plunger or male die is brought against thesheet-metal blank and forced through the female die, carrying with itthe sheet-metal blank, which, as it passes through, is turned up inlines parallel to the working-faces of the two dies, thus making thesides and ends of the box, and has its corners disposed equally eachside of, and carried through, the openings F back of the working-facesof the female die, wherein, by the inclination thereof of its two walls,d f, the said corners are folded against the sides and ends of the boxat each corner, so that when the box escapes at the delivering end ofthe female die, by the continued forcing of the male die through it, theportion of the sheetmetal blank at each corner thereof is disposed inequal parts, each side of the corners to the box sides and ends.

By removing the working-faces D of the male die at and upon each cornerthereof, as shown at 1, Fig. 1, it allows the fold of the sheet metal ateach corner, in the operation of the parts, to be made even with theouter surfaces of the sides and ends of the box, against which they liewhen folded, as described.

The working-faces (J of the female die are, by preference, made of steeland secured in position by a dovetail connection, K, between them andthe holder or block, which dovetail connection is fastened by aset-screw, L. This allows the working-faces to be removed and new onesinserted at pleasure, should it be found necessary.

Lids to boxes may be made in the same manner as described above for thebox proper.

Having now described my invention, what I claim, and desire to secure byLetters Patent, is-

The female die A, constructed at its corners with the openings a, andspaces or openings F back of the working-faces of the die, said openingsor spaces F having inclined walls cl and f, substantially as described,whereby, when the plnngerforces the sheet metal into the female die toform the box, the corners of said metal are forced through the openingsF, and by the inclined walls d and f the metal is folded against thesides and ends of the box, as set forth.

The above specification of my invention signed by me this 11th day ofMarch, A. D. 1875.

HENRY MARTYN.

Witnesses:

EDWIN W. BROWN, GEO. H. EARL.

